Number of simple lattice paths, steps (-1,0,0),(0,-1,0),(0,0,-1), of length 3n from (n,n,n) to the origin, never returning to the diagonal x = y = z before the origin.
A378026
Number of simple lattice paths, steps (-1,0,0),(0,-1,0),(0,0,-1), of length 3n from (n,n,n) to the origin, never returning to the diagonal x = y = z before the origin.
Terms
- a(0) =1a(1) =6a(2) =54a(3) =816a(4) =14814a(5) =295812a(6) =6262488a(7) =137929392a(8) =3125822238a(9) =72383434332
External references
- oeis: A378026